The invention discloses a black-start comprehensive verification system of a power system and a method of the black-start comprehensive verification system. With the black-start comprehensive verification system, various technological verification problems of black start are solved on the same system platform, verification calculation results of overvoltage verification of a black-start scheme of the power system, voltage frequency verification during starting of an auxiliary machine and self-excitation verification are output by verification calculation of all contents such as overvoltage verification of the given black-start scheme, the voltage frequency verification during starting of the auxiliary machine and the self-excitation verification, and thus, whether the set black-start scheme of the power system is appropriate or not can be effectively determined; and meanwhile, by a friendly pattered human-computer interaction interface, the burdens of system model building and data input/output processing are reduced, result analysis and verification conclusion judgment are automatically carried out, the verification complexity and the working burden of the black-start scheme are greatly reduced, and an effective auxiliary tool is provided for making and revision of the black-start scheme.